Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate		40.50%	(22.80%)
Reversal of valuation allowance on net deferred tax assets	$ 61.9
Increase (decrease) in deferred tax asset				$ (9.0)
Deferred tax assets, net	$ 67.8	$ 58.8		$ 67.8